FYI:
Looks like my app is doomed.
As a workaround I implemented custom c3p0 ConnectionTester that skips the active connection check when SQLException occurs.
When I try to close the connection later ...
Name: pool-16-thread-1
State: RUNNABLE
Total blocked: 0 Total waited: 18
Stack trace:
java.net.SocketInputStream.socketRead0(Native Method)
java.net.SocketInputStream.read(SocketInputStream.java:150)
java.net.SocketInputStream.read(SocketInputStream.java:121)
java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
java.io.BufferedInputStream.read1(BufferedInputStream.java:275)
java.io.BufferedInputStream.read(BufferedInputStream.java:334)
- locked java.io.BufferedInputStream@3fd537d
nl.cwi.monetdb.mcl.net.MapiSocket$BlockInputStream._read(MapiSocket.java:846)
nl.cwi.monetdb.mcl.net.MapiSocket$BlockInputStream.readBlock(MapiSocket.java:895)
nl.cwi.monetdb.mcl.net.MapiSocket$BlockInputStream.read(MapiSocket.java:965)
sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:283)
sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:325)
sun.nio.cs.StreamDecoder.read(StreamDecoder.java:177)
- locked java.io.InputStreamReader@6c743596
java.io.InputStreamReader.read(InputStreamReader.java:184)
java.io.BufferedReader.fill(BufferedReader.java:154)
java.io.BufferedReader.readLine(BufferedReader.java:317)
- locked java.io.InputStreamReader@6c743596
java.io.BufferedReader.readLine(BufferedReader.java:382)
nl.cwi.monetdb.mcl.io.BufferedMCLReader.readLine(BufferedMCLReader.java:119)
nl.cwi.monetdb.mcl.io.BufferedMCLReader.waitForPrompt(BufferedMCLReader.java:196)
- locked nl.cwi.monetdb.mcl.io.BufferedMCLReader@416a427a
nl.cwi.monetdb.jdbc.MonetConnection$ResponseList.executeQuery(MonetConnection.java:2296)
- locked nl.cwi.monetdb.mcl.net.MapiSocket@27327923
nl.cwi.monetdb.jdbc.MonetConnection$ResponseList.processQuery(MonetConnection.java:2274)
nl.cwi.monetdb.jdbc.MonetConnection.rollback(MonetConnection.java:1019)
com.mchange.v2.c3p0.impl.C3P0ImplUtils.resetTxnState(C3P0ImplUtils.java:275)
com.mchange.v2.c3p0.impl.NewPooledConnection.reset(NewPooledConnection.java:388)
com.mchange.v2.c3p0.impl.NewPooledConnection.markClosedProxyConnection(NewPooledConnection.java:362)
- locked com.mchange.v2.c3p0.impl.NewPooledConnection@18d223e6
com.mchange.v2.c3p0.impl.NewProxyConnection.close(NewProxyConnection.java:1220)
- locked com.mchange.v2.c3p0.impl.NewProxyConnection@62aefcef
com.sokrati.moneta.commands.EndTransactionCommand.run(EndTransactionCommand.java:101)
com.sokrati.commandManager.CommandExecutor.execute(CommandExecutor.java:49)
com.sokrati.moneta.channels.ChannelBulkQueryExecutor.execute(ChannelBulkQueryExecutor.java:91)
com.sokrati.moneta.channels.ChannelProcessorCallable.call(ChannelProcessorCallable.java:91)
com.sokrati.moneta.channels.ChannelProcessorCallable.call(ChannelProcessorCallable.java:1)
java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
java.util.concurrent.FutureTask.run(FutureTask.java:166)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
java.lang.Thread.run(Thread.java:722)
________________________________
From: Tapomay Dey
To: Communication channel for Monet DB users
Sent: Thursday, December 20, 2012 12:56 PM
Subject: c3p0 ConnectionTester socket read stuck after SQLException
Please find the thread dump below.
Running MonetDB Database Server v1.6 (Oct2012-SP1). Compiled from MonetDB-11.13.5 src distribution.
C3P0 version: 0.9.1.2. Also tried with 0.9.2.
Occurs only after SQLException sometimes: INSERT INTO xyz : table xyz doesn't exist.
Otherwise it works great.
Also tried setting c3p0's preferredQuery for ConnectionTester to "select 1;". Problem persists.
Name: pool-15-thread-2
State: RUNNABLE
Total blocked: 0 Total waited: 1
Stack trace:
java.net.SocketInputStream.socketRead0(Native Method)
java.net.SocketInputStream.read(SocketInputStream.java:150)
java.net.SocketInputStream.read(SocketInputStream.java:121)
java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
java.io.BufferedInputStream.read1(BufferedInputStream.java:275)
java.io.BufferedInputStream.read(BufferedInputStream.java:334)
- locked java.io.BufferedInputStream@5cec5796
nl.cwi.monetdb.mcl.net.MapiSocket$BlockInputStream._read(MapiSocket.java:846)
nl.cwi.monetdb.mcl.net.MapiSocket$BlockInputStream.readBlock(MapiSocket.java:895)
nl.cwi.monetdb.mcl.net.MapiSocket$BlockInputStream.read(MapiSocket.java:965)
sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:283)
sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:325)
sun.nio.cs.StreamDecoder.read(StreamDecoder.java:177)
- locked java.io.InputStreamReader@206a6883
java.io.InputStreamReader.read(InputStreamReader.java:184)
java.io.BufferedReader.fill(BufferedReader.java:154)
java.io.BufferedReader.readLine(BufferedReader.java:317)
- locked java.io.InputStreamReader@206a6883
java.io.BufferedReader.readLine(BufferedReader.java:382)
nl.cwi.monetdb.mcl.io.BufferedMCLReader.readLine(BufferedMCLReader.java:119)
nl.cwi.monetdb.mcl.io.BufferedMCLReader.waitForPrompt(BufferedMCLReader.java:196)
- locked nl.cwi.monetdb.mcl.io.BufferedMCLReader@29f38115
nl.cwi.monetdb.jdbc.MonetConnection$ResponseList.executeQuery(MonetConnection.java:2296)
- locked nl.cwi.monetdb.mcl.net.MapiSocket@319f9f37
nl.cwi.monetdb.jdbc.MonetConnection$ResponseList.processQuery(MonetConnection.java:2274)
nl.cwi.monetdb.jdbc.MonetStatement.internalExecute(MonetStatement.java:508)
nl.cwi.monetdb.jdbc.MonetStatement.execute(MonetStatement.java:349)
nl.cwi.monetdb.jdbc.MonetStatement.executeQuery(MonetStatement.java:525)
com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnection(DefaultConnectionTester.java:73)
com.mchange.v2.c3p0.impl.DefaultConnectionTester.statusOnException(DefaultConnectionTester.java:143)
com.mchange.v2.c3p0.AbstractConnectionTester.statusOnException(AbstractConnectionTester.java:82)
com.mchange.v2.c3p0.impl.NewPooledConnection.handleThrowable(NewPooledConnection.java:437)
- locked com.mchange.v2.c3p0.impl.NewPooledConnection@3340302c
com.mchange.v2.c3p0.impl.NewProxyStatement.executeUpdate(NewProxyStatement.java:78)
com.sokrati.moneta.mclient.JdbcMonetdbClient.executeUpdate(JdbcMonetdbClient.java:154)
com.sokrati.moneta.multiplexer.MonetdbClientCallable.call(MonetdbClientCallable.java:46)
com.sokrati.moneta.multiplexer.MonetdbClientCallable.call(MonetdbClientCallable.java:1)
java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
java.util.concurrent.FutureTask.run(FutureTask.java:166)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
java.lang.Thread.run(Thread.java:722)
Regards,
Tapomay.
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